Paraformaldehyde (pfa), 300g, 99% Powder, For Making Formaldehyde, Formalin, Etc

US $19.00

New Bedford, Massachusetts, United States
Aug 20th

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From Wikipedia: Paraformaldehyde (PFA) is the smallest polyoxymethylene, the polymerization product of formaldehyde with a typical degree of polymerization of 8–100 units. Paraformaldehyde commonly has a slight odor of formaldehyde due to decomposition. Paraformaldehyde is a poly-acetal. Paraformaldehyde can be depolymerized to formaldehyde gas by dry heating and to formaldehyde solution by water in the presence of a base, an acid or heat. The high purity formaldehyde solutions obtained in this way are used as a fixative for microscopy and histology. The resulting formaldehyde gas from dry heating paraformaldehyde is flammable. Once paraformaldehyde is depolymerized, the resulting formaldehyde may be used as a fumigant, disinfectant, fungicide, and fixative. Longer chain-length (high molecular weight) polyoxymethylenes are used as a thermoplastic and are known as polyoxymethylene plastic (POM, Delrin). It was used in the past in the discredited Sargenti method of root canal treatment. Paraformaldehyde is not a fixative; it must be depolymerized to formaldehyde in solution. In cell culture, a typical formaldehyde fixing procedure would involve using a 4% formaldehyde solution in phosphate buffered saline (PBS) on ice for 10 minutes. In histology and pathology specimens preparation, usually, the fixation step is performed using 10% Neutral Buffered Formalin (4% formaldehyde) for, at least, 24 hours. Paraformaldehyde is also used to crosslink proteins to DNA, as used in ChIP (chromatin immunoprecipitation) which is a technique to determine which part of DNA certain proteins are binding to. Paraformaldehyde can be used as a substitute of aqueous formaldehyde to produce the resinous binding material, which is commonly used together with melamine, phenol or other reactive agents in the manufacturing of particle board, medium density fiberboard and plywood. To make Formalin, a 37% solution of Formaldehyde in water, from Photo Engineer: Take about 50 ml of warm water and add a drop of 37% Sulfuric Acid to it. This is common battery acid. Then add 37 grams of Paraformaldehyde to that in small amounts while stirring. It should dissolve. If it does not, add another drop of acid. When all solid is added, dilute this to 100 ml and this will make a 37% (weight / volume). Be careful as Formaldehyde is a gas and can overcome you in a closed space. Wear eye and hand protection and use a breath mask or work outdoors if possible. Similarly, to make 10% Neutral Buffered Formalin (4% formaldehyde), use 4 grams of Paraformaldehyde instead to make 100 ml. If you backpack to climb Mt. Everest, even a small butane tank would be too heavy to carry. Paraform can be compress into camping fuel pellets weighing only grams. It burns clean with no smoke or residues. Due to aldehyde's high reactivity, you can also use Paraformaldehyde to make fungicide, triethylamine (fish scent), adhesives, various resins, and many other cool things.

Condition:	New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is applicable). Packaging should be the same as what is found in a retail store, unless the item was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag. See the seller's listing for full details. ...	Preferred IUPAC Name	Polyoxymethylene
Common Name	Paraformaldehyde
MPN	371001
Brand	Unbranded
UPC	807425371001